BOAT AND STREAMS SOLVED PROBLEMS 2

1. 16/5 hours

2. 16/7 hours

3. 16/3 hours

4. 5 hours

16/3 hours

let the speed of stream be s

then speed of the boat is 2s

so the distance would be 2x2s=4s

total time=4s/(2s-s)+4s/(2s+s)

total time is 16/3 hours

1. 12 km/h

2. 20 km/h

3. 22 km/h

4. 2 km/h

2 km/h

the one way distance is 10 km

total time=10/(s+2)+10/(s-2)

total time is 5 hours

substitute and solve the question

we will get a quadratic equation=s^2-4s-4

solving we will get s=2 km/h

1. 3.5 hours

2. 3 hours

3. 4 hours

4. 2 hours

3 hours

distance/speed=time

15/(3+2)=3 hours

Time taken is 3 hours

1. 75 km

2. 85 km

3. 70 km

4. 80 km

80 km

let the distance be d

10=d/(15+25)+d/(25-15)

solving we get the value of d=80 km

1. 10 km/h

2. 20 km/h

3. 0 km/h

4. 15 km/h

0 km/h

let us assume the speed of river be s

40/(4-s)+40/(40+s)=20

solving we will get s=0

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